Cool! Thanks! By the way, it temperatures are for Geneva.That is a very interesting chart. I normally plant half of my daylily seeds in late November; some years they break ground about April 20, last year they broke ground in May. Mystery solved, April soil was 34 degree average last year. One of the drawbacks about planting daylily seeds during the cold months is that some seeds an acceptably small amount do frost heave and eventually germinate on top of the soil where their survival is unlikely.
Would some wheat seeds also frost heave? Possible.
Edit- X-Farmer Dan--forwarded the charts to the daylily forum; those that grow from seeds will find it interesting and helpful.
I buy my wheat by the ton. Little expensive in money and time to have to plant twice.When I was on the farm as a kid, I remember planting cereals as soon as the field was dry enough to carry equipment in spring. I'd use the same benchmark for a plot. Even if you get it wrong, get another $10 in seed and try again two weeks later .